Variable time sequential operated switch



Oct; 28, 1952 M G. BEAUTENSE VARIABLE TIME SEQUENTIAL OPERATED SWITCH 4 Sheets-Sheet 1 Filed 001.. 28, 1947 VOU'AGE suscfosz Zmoentor M. GEOEGFfi BEAUTENSE Bu Pan) A. TcLUnST.

(Ittotneg M G. BEAUTENSE VARIABLE TIME SEQUENTIAL OPERATED SWITCH Oct. 28, 1952 4 Sheets-Sheet 2 Filed 001. 28, 1947 3nnentor M. GEGZGES BEAUTENSE attorney Oct. 28, 1952 M G. BEAUTENSE VARIABLE TIME SEQUENTIAL OPERATED SWITCH 4 Sheets-Sheet 3 Filed 001.. 28, 1947 M- GEOEGES BEAUTENSE Zmnentor 27 Paul A. TM

Gttomeg Patented Oct. 28, 1952 UNITED STATES PATENT OFFlCE VARIABLE TIME SEQUENTIAL OPERATED SWITCH 17 Claims.

My invention relates to an electrical instrument particularly a multi circuit and sequence timer and multi voltage adjuster for the many circuits which may be used for sequence blasting operations and for numberous other purposes.

Among the purposes and objects of my invention are to provide an instrument having a plurality of circuits a part of which may be different from the others in sequence timing.

Another object is to provide a quick, easy, and convenient way to test and check each of a plurality of circuits at a glance.

Still another object is to provide an electrical instrument which may be used for mining operations to accurately time a series of blasts so that the ore is broken into smaller pieces and at the same time cover a larger area without the disastrous impact caused by fewer and larger blasts.

An object is to provide a combined operating knob and slider so that by its operation any circuit of many circuits may be tested in sequence or by separate selection over the entire range of a. plurality of speeds and a plurality of circuits for each speed.

Another object is to combine a circuit tester and a circuit maker for a plurality of electric circuits.

An object is to provide automatic means for disconnecting all of the circuits of a sequence timer after the last circuit in the sequence has been completed.

An object is to provide a separate sequence timer for blasting which may be positioned relatively close to the blast while the main blasting switch may be located at a greater safe distance from the blast.

An object is to simplify the operation of sequence blasting.

An object is to provide an electrical instrument for sequence blasting that is safe and yet simple and positive and easy to operate.

I accomplish these and other objects by the construction herein described and shown in the accompanying drawings which form a part of this, my disclosure.

In the drawings:

Fig. 1 is a plan view of my instrument with the cover removed.

Fig. 2 is a diagrammatic plan view above the sub panel.

Fig. 3 is part section and elevation of the interior.

Fig. 4 is plan view of the sequence operators and first intermediate panel.

Fig. 5 is a fragmentary plan view of the designator disc and indicia thereon.

Fig. 6 is a fragmentary plan of the operating knob and sequence selector and the adjacent top panel.

Fig. 7 is a fragmentary section at 1-4, Fig. 6.

Fig. 8 is a fragmentary elevational view showing the operating knob, sequence selector and guide arm.

Fig. 9 is a sectional detail at 99, Fig. '7.

Fig. 10 is a wiring diagram.

Timers, testing instruments and many of the parts of my device are well known and some of the parts are easily purchased in the open market. The novel combination of the parts and the new parts which cooperate to produce the results thus made possible will be better understood after a study of this disclosure by one skilled in the art to which my invention pertains.

My device is particularly adapted to blasting operations such as practiced in mining and may be used for other purposes or may be modified without departing from the principles underlying my invention to suit my electrical instrument for many uses. I have not attempted to describe all possible modifications and uses; these may suggest themselves after a study of this disclosure.

In mining, for instance, the ore is dislodged and broken up to a greater or less degree by the placing of the charges advantageously to cover the area which is to be removed. When the plurality of charges of explosive are fired simultaneously the impact caused by the explosions is not only dangerous and expensive, but the material is not well broken up which results in a loss in time in breaking up the large bodies of ore before the size of the pieces is reduced to the desired dimensions for removal.

The resulting danger from a simultaneous blast is manifest in flying debris which drops over a wide area, by the breaking and dislodging of building foundations, and windows from the concussion and shock of the concentrated cumulative blast and other surface damage and loss to life and property all of which are prevented by the use of my device which accurately times the sequence of blasts so that the result of the series of explosions is certain and the results as planned so that one blast cooperates with and cushions the adjacent blast.

The ease of testing each circuit is made so simple that the circuits are always tested thus leaving no uncertainty; each charge is fired at the exact fraction of a second to which the instrument is set.

When the charges are fired at intervals not properly timed, such as too slow sequence or irregular sequence, the effectiveness of the several charges, in dislodging the material. is diminished, thus larger charges are required to do the work and duds are frequent due to the dislodgement of the connecting wires.

By the use of my instrument the timing may be adjusted to the exact interval between the blasts so that each blast in its sequence assists the others so that minimum charges may be used and each blast assists the other in breaking up the material to the desired size, without the necessity of additional operations, thus saving time and cost of removing the material.

Time is also saved by the use of my instrument in setting the sequence of the blasts as desired to suit the length of wire and other conditions as well as in test checking each of the many circuits to the charges thereby eliminating duds and the consequent danger resulting therefrom. The wires to the charges remain undisturbed by previous blasts and each circuit is known to be perfect before the switch, which is thrown to set off the blasts, is contacted. This is accomplished automatically and in perfect sequence by my instrument which may be placed closer to the blasts than the main switch. The wires from the instrument to the blasts thus may be shortened;

In the specifications and drawings I have described and shown, in precise detail, a preferred embodiment of my invention rather than to digress in discussing the many modifications which may be possible.

The preciseness of the specifications and the preciseness of the drawings is not intended to limit the scope of my invention which is set forth in the appended claims.

In the drawings, to which reference is here made, I have shown a cabinet housing i, which completely incloses the various parts of my instrument. The housing is provided with a hinged cover 2 secured by the piano hinge 3 at the rear edge between the top A and the walls 5 which surround the panel 6 and the various parts secured to it except the terminal panel I, operating knob 8, and its sequence selector 9, voltage selector and switch I and fuses, etc. H which are positioned above the panel and in the confines of the'depending cover walls [2.

The panel 6 is preferably detachably secured to the cabinet housing by the screws l3 which engage the internal corner pieces I l so that the panel and all of the parts, normally secured to it, may be removed as a unit from the cabinet. Below the panel 6 I have provided the upper intermediate panel 15, lower intermediate panel [6 and sub panel ll all secured to and removable with the panel 6 by the through corner bolts [8 and distance pieces I9, 20 and 2| each being disposed at the four corners and of suitable length to hold the upper, lower and sub panels in parallelism when the nuts 22, which engage the threaded ends of the bolts [8 are tightened. Conversely by removing the nuts the several panels may be separated and detached from each other.

The panel 6 is preferably larger than those secured to it and the top edge of the cabinet housing is recessed at 23 to receive it while the panels below loosely fit within the walls of the cabinet to permit their free withdrawal with the panel 6 as a unit by removing the screws l3.

At substantially the center of the panels I and I 0 and secured to them by the bolts 24 I have provided the center bearing member 25 in which the bearings 26 rotatably mount the vertical spindle 21 which is provided at its upper end 4 with the guide way 28 in which the sequence selector guide arm 29 is slidably mounted to permit its movement radially by means of the sequence selector 9 which is connected to said arm through the knob 3 by the stud 30 which is threaded at its upper end to receive the tapped sequence selector which, when tightened, clamps the arm against accidental movement.

The arm is preferably provided with the notches 3|, 32, 33 and 34, which receive the spring detent 35 which positions the roller 36, which is rotatably mounted at the end of the arm, to sweep over and to operate any one of the contact operators 0 in any of the four segmental rows 31, 38, 39 or 40.

The knob 8 is detachably secured to the guide way 28 by the screws 4! which engage the tapped holes 42. The screws pass through the designator disc 43 thereby clamping the disc to the knob and to rotate with it and the spindle.

The stud 30 projects upwardly through and is free to travel radially in the slot 44 in the knob 8, designator disc and guide way to any one of the four positions chosen by the sequence selector 3. Thus the knob may rotate the arm and the sequence selector may cause the roller secured thereto on the arm to travel over contact operators in any of the plurality of rows as selected. Indicia 45 may be calibrated to designate the time period for which the contact operators complete the sequence of contacts such as for the operation of a sequence of blasts; each of the four rows having a different time or elapsed time for completing all of the contacts.

Secured to the lower end of the spindleZl I have provided the gear 46 which meshes with the gear M which is driven by the motor 48 for rapidly rotating the spindle and the roller 36 thereby to cause the roller to rapidly sweep over and to depress the operators in sequence.

The operators are preferably each provided with a conical upper end 43 which extends above the top surface 50 of the panel 15 over which the roller travels. Each operator is guided in an aperture in the upper intermediate panel and is provided with a shoulder 53 which limits its upward travel which is provided by pressure caused by the resilience of the top leaf 52 of the contacts. Each upper contact 53, which is secured to the leaf spring 52, is pressed downward by the operator to make contact with the lower contact 54 to complete one circuit of the plurality of elec tric circuits which are completed by the roller passing over its respective operator in rapid'sequence when the arm and roller are rotated by the motor.

For testing each circuit the knob is turned to thenumber which appears on the indicia 55 on the disc 43 through one of the windows 58, 51, 58 or 533; one of the windows representing the particular segmental row of operators to which the sequence selector has been set. If set to .010 the window .010 as shown by the indicia 60 along side the windows will show that the circuit being 6|, secured to the lower contact 5d, are each secured, near the end opposite the contact, to one of four insulated rings 62, 83, 64 or B5 and the ends 66 of each of the top leaves are connected to the Wires 68 which are connected to a common feeder 12. The ends 67 of the lower leaf 6| are connected to their respective fuses i and to the terminal binding posts 11 where wires are attached to each blast or other load to which the instrument is electrically connected, A further description of the connections and wiring diagram is explained later. A transformer 13 is provided with a plurality of voltage taps M, 15 and 16 to suit the available voltage and to provide the instrument with 115 volts with electric alternating current through the terminals 69 and from the source of electric power which may be 115, 230 or 460 volts.

Above each of the rings 62, E3, 64 or 65 I have provided guide rings ll, l3, l9 and 80, each of which is apertured to receive and guide the lower end of the operators 0 and to cooperate with the lower ring 8| and upper and lower intermediate panels l and IE to hold the several rings in place as a unit together with the contact leaf springs which are secured to and spaced apart by the rings 62, 63, 64 and $5. All of the several rings and panels are constructed with insulating material. The several rings are so proportioned in relation to their diameter that the contacts and operators are radially diiferently spaced. The outer segment of operators are shorter and move the upper segment of contacts; each of the other segments or operators are progresisvely longer and the contacts moved by them are arranged progressively nearer to the center and below the contacts in the next bank of contacts above.

Each of the segments of operators and contacts is progressively circumferentially longer than the outer row of operators and contacts; disposed over a greater number of degrees so that the roller, which moves them by pressing them downwardly, travels a greater part of the circle when set to move the operators in the segment nearest the center about which the roller travels on its guide arm than when set to move another segment of operators further from the center which arrangement causes a greater period of elapsed time for the roller to move the operators in the segment having the shorter radius; nearer the center than the rows of segments having a greater radius.

The motor 48 which rotates the arm and its roller to move the operators in sequence thus requires a longer relative time to move the operators in the segment nearest the center and each contact thus completes the circuit at a longer time interval in relation to its next contact in sequence. When the sequence selector is moved to place the roller to travel over the segmental row of operators further from the center the time is shortened; the indicia on the knob shows one hundredth of a second for the completion of the circuits by the outer segmental row of operators and twenty-five thousandths of a second for the inner segmental row of operators; two and onehalf times greater. The time for the completion of the circuits in each of the segmental rows as well as the number of rows and the number of circuits in each row may be made to suit the particular use for which my instrument may be applied; however the relative angular distance traveled by the roller in making the contacts in one row of operators in relation to those in another governs the relative time interval between the 6. completion of the circuits in one row as compared with another.

To prevent a repetition of the completion of circuits which might be caused by the roller traveling over the same operators a second time I have provided an additional operator 82 at the end of and beyond the rest of the operators 0. The additional operator shuts off the supply of current so that the others may be moved by the roller without completing electric circuits.

The additional operator 32 is provided with contacts 83 and 84 and leaf springs similar to the others in its respective segmental row, said contacts 83 and 84 having the wires 72 and 81 which are connected by the contacts 83 and 84 to supply current to the relay 88 as may be seen by referring particularly to the wiring diagram in Fig. 10.

Upon completing the chain of circuits in sequence in any of the several rows of operators and contacts, the relay 88 then breaks the circuit to the motor through the wire 89 from the transformer l3 and the wire 98 to the motor 48 and also breaks the circuit to the relay 9| through the wire 92 which in turn breaks the circuit to the operators 0 through the wires and 12 and connects the circuit to the operators through the wires 12 and 93 to the common 95 for testing; the relay 9! being frozen or at rest.

In addition to the operating knob 8 and its cooperating sequence selector 9, the circuit terminals or binding posts H, fuses i0, spare fuses I00, main terminals 69, windows etc., on the panel 6, I have provided the voltage selector knob l0 having the pointer I92 which may be rotated to register with the designations on the indicia I03. Three of the designations are shown as l I5, 233 and 450 volts; a designation for test and another oil complete the positions to which the pointer I62 may be set.

The transformer 73 may thus always deliver volts while the source, or line voltage, may be 115, 230 or 460 at which voltage the knob and pointer are set.

After testing the circuits and the instrument is ready to complete the circuits in sequence to the load or loads 164 the common I05 from the load is connected to the common binding post I06 to which the wire 95 is also connected. The remote switch I01 is moved to closed position which operates the motor which has been previously set at start by the operating knob 8, the roller 36 depresses the operators 0 in sequence and the contacts are provided with H5 volts through the wires 89 and 94; the relay SI having been energized to move during the operation of the contacts by the wires 89 and 92.

When the roller has completed its sequence of circuits to the load and then moves the operator 82 the wire 81 energizes relay 83 thereby breaking the circuit to the motor through the wire 89 and 98 and also breaking the circuit to the relay 9! through the wires 89 and 92 to cause the circuit to the operators 0 to be also broken through the wires 89, 94 and 12 so that even though the motor may not have completely stopped, the roller may make contacts in sequence a second time without the contacts completing an electric circuit.

The materials and size and number of the parts may vary to suit the operating conditions and the construction modified to suit the many uses for which my instrument may be adapted without departing from the principles which underly my invention.

' Having thus disclosed the construction of a preferred embodiment of my invention what I claim as new and desire to secure by Letters Patent is set forth in the following claims.

I claim:

1. In an electrical device having a plurality of circuits which may be closed in sequence and having a plurality of operators disposed in a row and contact means moved by said operators for closing said circuits and a motor and arm driven by said motor at a uniform speed, said arm having means thereon for moving said operators in progressive sequence, said means on said arm being adjustable to a second position a second row of operators and contacts movable by said means on said arm, having a spaced relationship to cause a substantially longer period of time when moved by said means on said arm than required for said first row, whereby the time required for completing the circuits in said second row is greater than the time required to complete the circuits in said first row.

2. In an electrical device having a plurality of circuits which may be closed in sequence and having a plurality of operators disposed in a row and contact means moved by said operators for closing said circuits and a motor and arm driven by said motor at a uniform speed, said arm having means thereon for moving said operators in progressive sequence, a second row of operators and contacts movable by said means on said arm, having a spaced relationship to cause a substantially longer period of time when moved by said means on said arm than required for said first row, whereby the time required for completing the circuits in said second row is greater than the time required to complete the circuits in said first row and manually operated selector means, and indiced thereon for moving said operator means and arm radially to change and indicate the row of operators selected.

3. An electric circuit sequence switch having a plurality of segmental rows of circuit making contacts and their operators forming segmental paths and a rotatable arm with a roller radially adjustable to travel in one of said segmental paths to move said operators in one of the said segmental rows and motor operated means to move said arm at a uniform speed, each of said segmental rows having an equal number of said operators and spaced to require said roller to complete the circuits in the row nearest the center in a longer period of time than to complete the circuits in the row radially farthest from said center.

4. An electric circuit sequence switch having a plurality of segmental rows of circuit making contacts and their operators forming segmental paths and a rotatable arm with a roller radially adjustable to travel in one of said segmental paths to move said operators in one of the said segmental rows and motor operated means to move said arm at a uniform speed, each of said segmental rows having an equal number of operators and contacts said row nearest the center having a longer period of time to complete the circuits than in the row radially farthest from said center, said roller traveling a greater number of degrees on the arc of travel in traversing the row nearest the center.

5. An electric circuit sequence switch having a plurality of segmental rows of circuit making contacts and their operators forming segmental paths and a rotatable arm with a roller radially adjustable to travel in one of said segmental paths to move said operators in one of the said segmental rows and motor operated means to move said arm at a uniform speed, each of said segmental rows having an equal number of said operators and spaced to require said roller to complete the circuits in the row nearest the center in a longer period of time than to complete the circuits in the row radially farthest from said center, and a sequence selector and means operable by said sequence selector to adjust said roller radially.

6. An electric circuit sequence switch having a plurality of segmental rows of circuit making contacts and their operators forming segmental paths and a rotatable arm with a roller radially adjustable to travel in one of said segmental paths to move said operators in one of the said segmental rows and motor operated means to move said arm at a uniform speed, each of said segmental rows having an equal number of said operators and spaced to require said roller to complete the circuits in the row nearest the center in a longer period of time than to complete the circuits in the row radially farthest from said center and a sequence selector and means operable by said sequence selector to adjust said roller radially and a means having indicia thereon to indicate the row of operators selected and the time traversed by said roller in completing the sequence selected.

'7. An electric circuit sequence switch having a plurality of segmental rows of circuit making contacts and their operators forming segmental paths and a rotatable arm with a roller radially adjustable to travel in one of said segmental paths to move said operators in one of the said segmental rows and motor operated means to move said arm at a uniform speed, each of said segmental rows having an equal number of said operators and spaced to require said roller to complete the circuits in the row nearest the center in a longer period of time than to complete the circuits in the row radially farthest from said center, a knob for operating said arm and roller having a slot and indicia and a sequence selector and means movable in said slot connecting said sequence selector to said arm to move said roller to the row of operator selected and to indicate said selection.

8. A sequence circuit making electrical instrument for making and testing a plurality of electric circuits having a plurality of operators and a yielding contact for closing one of each'of the circuits by the movement of one of the operators, a motor operated means for moving said operators in sequence and a panel and knob rotatably mounted thereon to move said operators independent of said motor and a plurality of rows of said plurality of operators and selector means radially movable in said knob to change said means for moving said operators from one of said rows to another to change the period of time of the sequence of said contacts and a designator disc movable with said knob' and having indicia thereon corresponding to each tric circuits having a plurality of operators anda yielding contact for closing one of each of the circuits by the movementof one of the operators, a motor operated roller guided in a path at a fixed speed to close each circuit by moving each operator and yielding contact in sequence and a plurality of said paths, each having a different spaced relationship to the travel of said roller, said operators and contacts having different spaced relationships to cause said roller to require a substantially different time lapse in completing each circuit or all of said circuits in any one of said paths in relation to any other of said paths.

10. A sequence circuit making electrical instrument for making and testing a plurality of electric circuits having a plurality of operators and a yielding contact for closing one of each of the circuits by the movement of one of the operators, a motor operated roller guided in a path at a fixed speed to close each circuit by moving each operator and yielding contact in sequence and a plurality of said paths, each having a difierent spaced relationship to the travel of said roller, said operators and contacts having different spaced relationships to cause said roller to rewquire a substantially different time lapse in completing each circuit or all of said circuits in any one of said paths in relation to any other of said paths, a plurality of rows of said operators and yielding contacts, each of said rows comprising a single path. and being greater or less in length than the row adjacent for changing the time required by said motor to complete the plurality of circuits in each respective row.

11'. A sequence circuit making electrical instrument for making and testing a plurality of electric circuits having a plurality of operators and a yielding contact for closing one of each of the circuits by the movement of one of the operators, av motor operated roller guided in a path at a fixed speed to close each circuit by movin each operator and yielding contact in sequence and a plurality of said paths, each having a different spaced relationship to the travel of said roller, said operators and contacts having different spaced relationships to cause said roller to require a substantially diiierent time lapse in completing each circuit or all of said circuits in any one of said paths in relation to any other of said paths, a plurality of rows of said operators and yielding contacts, each of said rows comprising a single path and being greater or less in length than the row adjacent for changing the time required by said motor to complete the plurality of circuits in each respective row, an arm for mounting said roller and a sequence selector to move said arm and said roller radially for changing the path of said roller from one row to another.

12. A sequence circuit making electrical instrument for making and testing a plurality of electric circuits having a plurality of operators and a yielding contact for closing one of each of the circuits by the movement of one of the operators, a motor operated roller guided in a path at a fixed speed to close each circuit by moving each operator and yielding contact in sequence and a plurality of said paths, each having a different spaced relationship to the travel of said roller, said operators and contacts having different spaced relationships to cause said roller to require a substantially different time lapse in completing each circuit or all of said circuits in any one of said paths in relation to any other of said paths, a plurality of rows of said operators and yielding contacts, each of said rows comprising a single path and being greater or less in length than the row adjacent for changing the time required by said motor to complete the plurality of circuits in each respective row, an :arm for mounting said roller, and a sequence selector to move said arm and said roller radially for changing the path of said roller from one row to another, and a knob independent of said motor for moving said roller to operate any one or all of the operators in any of said rows of operators, said knob having indicia thereon for setting said sequence selector at any one of said plurality of rows of operators.

13. A sequence circuit making electrical instrument for making and testing a plurality of electric circuits having a plurality of operators and a yielding contact for closing one of each of the circuits by the movement of one of the operators, a motor operated roller guided in a path at a fixed speed to close each circuit by moving each operator and yielding contact in sequence and a plurality of said paths, each having adifferent spaced relationship to the travel of said roller, said operators and contacts having different spaced relationships to cause said roller to require a substantially different time lapse in completing each circuit or all of said circuits in any one of said paths in relation to any other of said paths, a, plurality of rows of said operators and yielding contacts, each of said rows comprising a single path and being greater or less in length than the row adjacent for changing the time required by said motor to complete the plurality of circuits in each respective row, a panel and a knob rotatably mounted thereon to move said roller in a path to move said operators in sequence, said knob having a slot therein and a stud secured to said sequence selector and said arm movable in said slot to move said roller from one row to another.

14. A sequence circuit making electrical instrument for making and testing a plurality of electric circuits having a plurality of operators and a yielding contact for closing one of each of the circuits by the movement of one of the operators, a motor operated roller guided in a path at a fixed speed to close each circuit by moving each operator and yielding contact in sequence and a plurality of said paths, each having a different spaced relationship to the travel of said roller, said operators and contacts having diiTerent spaced relationships to cause said roller to require a substantially different time lapse in completing each circuit or all of said circuits in any one of said paths in relation to any other of said paths, a plurality of rows of said operators and yielding contacts, each of said rows comprising a single path and being greater or less in length than the row adjacent for changing the time required by said motor to complete the plurality of circuits in each respective row, a panel and a knob rotatably mounted thereon to move said roller in a path to move said operators in sequence and a sequence selector radially movable in relation to said knob to change the path of travel of said roller from one row of operators to another row, said knob having a slot and stud movable therein secured to said arm and sequence selector for moving said arm and roller.

15. A sequence circuit making electrical instrument for making and testing a plurality of electric circuits having a plurality of operators and a yielding contact for closing one of each of the circuits by the movement of one of the opferent spaced relationship to the travel of said roller, said operators and contacts having different spaced relationships to cause said roller to require a substantially difierent time lapse in completing each circuit or all of said circuits in any one of said paths in relation to any other of said paths, a plurality of rows of said operators and yielding contacts, each of said rows comprising a single path and being greater or less in length than the row adjacent for changing the time required by said motor to complete the plurality of circuits in each respective row, a panel and a knob rotatably mounted thereon to move said roller in a path to move said operators in sequence and a sequence selector radially movable in relation to said knob to change the path of travel of said roller from one row of operators to another row and indicia means on said knob to designate the particular row of operators said roller is set to operate, said knob having a slot and stud secured to said arm and said sequence selector movable in said slot to move said arm.

'16. A sequence circuit making electrical instrument for making and testing a plurality of electric circuits, switches arranged in segmental rows each having a plurality of operators and a yielding contact for closing one of each of the switches by the movement of one of the operators, a motor having means supporting and operating a roller for moving said operators in sequence at a uniform rate of speed to traverse said operators and a panel and knob rotatably mounted on said supporting and operating means to move said operators independent of said motor, said knob having a slot and a stud mov- 12 able therein for moving said roller for traversing any one of said segmental rows and a sequence selector secured to and to operate said stud.

17. A sequence circuit making electrical instrument for making and testing a plurality of electric circuits having a plurality of rows of operators and a plurality of operators in each row and a yielding contact for closing one of each of the circuits by the movement of one of the op erators, a motor operated means having an adjustable actuator for moving said operators in sequence and a panel and knob rotatably mounted thereon to move said actuator independent of said motor to any of said plurality of rows of said operators and selector means radially movable in said knob to change said actuator from one of said rows to another to change the period of time of sequence of said contacts.

M GEORGES BEAUTENSE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 808,275 Dodson Dec. 26, 1905 908,117 Murray Dec. 29, 1908 916,476 McLarty Mar. 30, 1909 1,402,927 Grazier Jan. 10, 1922 1,440,803 Uphoff Jan. 2, 1923 1,733,817 Moranor Oct. 29, 1929 2,068,227 Cutler et a1 Jan. 19, 1937 2,097,330 Kiena Oct. 26, 1937 2,378,294 Field et al. June 12, 1945 FOREIGN PATENTS Number Country Date 5,637 Great Britain of 1913 

